事件处理程序行为 [英] Event handler behavior
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问题描述
如果我选择DropDown类型组合框的元素，则除非再次选择该元素，否则不会调用ON_CBN_CLOSEUP()事件处理程序.但是，当我更改为DropDownList类型时，第一次选择元素时会调用ON_CBN_CLOSEUP()事件处理程序.有人知道为什么吗?
If I choose an element of the DropDown type combo box, the ON_CBN_CLOSEUP() event handler is NOT called unless I select the element again. But when I change to DropDownList type, the ON_CBN_CLOSEUP() event handler is called the first time I select an element. Does anyone know why?
推荐答案
根据MSDN(
According to MSDN (reference), the ON_CBN_CLOSEUP message is not sent for a combo box that has the CBS_SIMPLE style. I think that is your problem. If you are using this setup on the combo box, then just use the ON_CBN_SELCHANGE event and you should get the event you need, that is unless you have a different reason for not using this one in the first place.
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